Test run failed: Instrumentation run failed due to 'Process crashed.' when testing multiple Android activity

Question

I've got an issue with testing my android application.
I have 2 testCase class, if I execute them separately, there is no problem, the tests run until the end. But if I do "right-click" on my test project and choose "Run as Android Junit Test" I've got a message

 Launching instrumentation android.test.InstrumentationTestRunner on device emulator-5554
 [2012-03-27 15:56:27 - matroussedemaquillageTest] Collecting test information
 [2012-03-27 15:56:31 - matroussedemaquillageTest] Test run failed: Instrumentation run  failed due to 'Process crashed.'

see bellow for my two testClasses:

the first test class

package fr.smardine.matroussedemaquillage.test;

import android.test.ActivityInstrumentationTestCase2;
import android.widget.ImageSwitcher;
import fr.smardine.matroussedemaquillage.EntryPoint;

public class EntryPointTest extends
    ActivityInstrumentationTestCase2<EntryPoint> {

private EntryPoint mActivity;
    private ImageSwitcher mSwitcher;

    public EntryPointTest() {
        super("fr.smardine.matroussedemaquillage",
                fr.smardine.matroussedemaquillage.EntryPoint.class);
    }

    @Override
    protected void setUp() throws Exception {
        super.setUp();
    }

    @Override
    protected void tearDown() throws Exception {
        super.tearDown();
    }

    public void test2() {
        assertEquals(2, 2);
    }
}

and the second:

package fr.smardine.matroussedemaquillage.test;

import android.test.ActivityInstrumentationTestCase2;
import android.widget.ImageView;
import fr.smardine.matroussedemaquillage.Main;

public class MainTest extends ActivityInstrumentationTestCase2<Main> {

    private Main mActivity;
    private ImageView btRemplir;
    private ImageView btPerime;
    private ImageView btNotes;

    public MainTest() {
        super("fr.smardine.matroussedemaquillage",
                fr.smardine.matroussedemaquillage.Main.class);
    }

    @Override
    protected void setUp() throws Exception {
        super.setUp();
    }

    @Override
    protected void tearDown() throws Exception {
        super.tearDown();
    }


    public void test1() {
        assertEquals(1, 1);
    }
}

As you can see my test are not so complicated, even if i "wipe user data" when I launch my emulator, there is the same message if I execute the two tests.
Oh, by the way, the emulator run under android 2.1 and this is my AndroidManifest.xml file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="fr.smardine.matroussedemaquillage.test"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="7" android:targetSdkVersion="7" />

<instrumentation
    android:name="android.test.InstrumentationTestRunner"
    android:targetPackage="fr.smardine.matroussedemaquillage" />

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <uses-library android:name="android.test.runner" />
</application>

</manifest>

Edit: my log cat:

I/ActivityManager(64): Start proc fr.smardine.matroussedemaquillage for added application fr.smardine.matroussedemaquillage: pid=510 uid=10029 gids={3003, 1015} 
D/ddm-heap(510): Got feature list request D/dalvikvm(510): GC freed 5427 objects / 420224 bytes in 90ms 
D/dalvikvm(510): GC freed 6498 objects / 506616 bytes in 79ms 
D/dalvikvm(510): GC freed 7048 objects / 567464 bytes in 90ms 
D/dalvikvm(510): GC freed 8628 objects / 503840 bytes in 73ms 
I/System.out(510): Failed to open test.properties 
I/AndroidRuntime(510): AndroidRuntime onExit calling exit(-1) –
D/Zygote(30): Process 510 exited cleanly (255) 
I/ActivityManager(64): Process fr.smardine.matroussedemaquillage (pid 510) has died. 
W/ActivityManager(64): Crash of app fr.smardine.matroussedemaquillage running instrumentation ComponentInfo{fr.smardine.matroussedemaquillage.test/android.test.Instrumentatio‌​nTestRunner} 
D/ActivityManager(64): Uninstalling process fr.smardine.matroussedemaquillage
D/AndroidRuntime(504): Shutting down VM 
D/dalvikvm(504): DestroyJavaVM waiting for non-daemon threads to exit 
D/dalvikvm(504): DestroyJavaVM shutting VM down
D/dalvikvm(504): HeapWorker thread shutting down 
D/dalvikvm(504): HeapWorker thread has shut down 
D/jdwp(504): JDWP shutting down net... 
D/jdwp(504): Got wake-up signal, bailing out of select 
I/dalvikvm(504): Debugger has detached; object registry had 1 entries 
D/dalvikvm(504): VM cleaning up 
D/dalvikvm(504): LinearAlloc 0x0 used 643668 of 5242880 (12%) 
I/dalvikvm(504): JNI: AttachCurrentThread (from ???.???) 
E/AndroidRuntime(504): ERROR: thread attach failed'

Answer 1

I used to get this error when I used System.exit(0) on my test Activity's onFinish like below:

@Override
    public void finish() {
        super.finish();
        System.exit(0);

    }

So check your Main activity's onFinish method.